Ticket #22682: 22682.1.diff

wp-admin/js/customize-controls.js

@@ -862 +862 @@
                         if ( 9 === event.which ) // tab
                                 return;
                         if ( 13 === event.which ) // enter
-                                parent.send( 'close' );
+                                this.click();
                         event.preventDefault();
                 });